Meteora

Meteora is in central Greece. It is thought this area was an inland sea until an earthquake let the water out. The result are these huge pinacles of rock rising hundreds of feet over the plain. In 1500 there were 24 monastaries on these pinacles, of which 6 remain and welcome visitors. Historiclly access was only through nets and winches. Now, there are stairs cut through the rock, but it's a difficult climb.